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Old 10-10-2013, 11:18 AM   #1
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Default No fuel/No spark... ideas?

I am having a no fuel, no spark issue.

I have a 1992 1.6L turbo miata running on a Link ECU. It has been running without issues for over a year. While coming back from a trip, the car suddenly started running rough, the tach was jumping all over the place. I pulled over and it would start, run rough, then turn off. I had it towed home. The next day it started and ran with no issues for a 10 mile drive. I made a stop on the way home and it happened again - I would start it up, it would run rough and turn off while the tach would jump erratically. The next morning, I brought help to diagnose the problem - but it ran fine and I drove it home.

Now it cranks and doesn't start. I have no fuel, no spark. It turns over, I can see the cams turning (my valve cover is cut to allow access the cams) but the tach does not move.
There is no CEL and there are no codes when I jumper the diagnostic box

The fuel pump sounds like it is turning on. No fuel on the plugs when checking for spark.
I have replaced the CAS sensor with a used one with no change.
I have tried replacing the igniter with no change.
I have tried plugging in a stock ECU with no change. ECU is getting power.
I have tried replacing the main relay with no change.
I have cleaned the ignition.
I have tested the coilpacks and they seem to check out based on the values listed on miata.net

what else effects both fuel and spark? Anything else I should try/check out before diving into the harness?
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Old 10-10-2013, 12:04 PM   #2
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How did you confirm you had no spark?
Sounds like it may have originally been related to temperature. (10min drive, everythings up to temp, dies)
Fuel filter?
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Old 10-10-2013, 01:17 PM   #3
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took a plug out, grounded to chassis, cranked.

how would a fuel filter cause no spark?

the first time it died was driving for 2 hours, stopping for gas, and trying to start it again.
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Old 10-10-2013, 08:45 PM   #4
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Fuel is getting to the FPR but no fuel on the plugs.
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Old 10-12-2013, 02:00 AM   #5
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I had this happen to me once on my 92. If anything that works with 5v gets grounded where its not supposed to, the ECU pretty much says "nope", even if its getting power.

My AFM was shorted internally, and replacing it fixed everything.

Does your check engine light turn on at all? If the light won't turn on KOEO, something is forcing the ECU to turn off.

EDIT: Just in case your CEL isn't turning on, turn the ignition on and start unplugging things under the hood. When it turns on, you found your problem. That's how I fixed my car anyway.
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Old 10-18-2013, 03:50 AM   #6
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Sounds like it may have originally been related to temperature.
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Old 10-18-2013, 09:40 AM   #7
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Quote:
Originally Posted by MartinezA92 View Post
I had this happen to me once on my 92. If anything that works with 5v gets grounded where its not supposed to, the ECU pretty much says "nope", even if its getting power.

My AFM was shorted internally, and replacing it fixed everything.

Does your check engine light turn on at all? If the light won't turn on KOEO, something is forcing the ECU to turn off.

EDIT: Just in case your CEL isn't turning on, turn the ignition on and start unplugging things under the hood. When it turns on, you found your problem. That's how I fixed my car anyway.
thanks i have no CEL so I will try this.

Does temperature point to anything? Temperature doesn't matter at the moment since it's not sparking/getting fuel to the cylinders at all (confirmed fuel pump is working).
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